var phoneWidth = parseInt(window.screen.width);
var phoneHeight = parseInt(window.screen.height);
var phoneScale = phoneWidth / 720;
var ua = navigator.userAgent;
if(/Android (\d+\.\d+)/.test(ua)) {
	var version = parseFloat(RegExp.$1);
	// andriod 2.3
	if(version > 2.3) {
		document.write('<meta name="viewport" content="width=device-width,initial-scale=' + phoneScale + ',minimum-scale=' + phoneScale + ',maximum-scale=' + phoneScale + ',user-scalable=no">');
		// andriod 2.3以上
	} else {
		document.write('<meta name="viewport" content="width=device-width,user-scalable=no">');
	}
	// 其他系统
} else {
	document.write('<meta name="viewport" content="width=device-width, initial-scale=' + phoneScale + ',minimum-scale=' + phoneScale + ',maximum-scale =' + phoneScale + ',user-scalable=no,">');
}